2-Way Valve to open on rising pressure
Port 1 must be plugged. Rising pressure will open
Port 2 to Port 3 above the trip point.

Valve to open on falling pressure
Port 3 must be plugged. Falling pressure will open
Port 2 to Port 1 below the set trip point.

3-Way Valve operation for 3-Way action is identical with that for 2-Way except that there will be no plugged ports. On valves set to trip on rising pressure, Port 1 will open to Port 2 until just below the trip point. Port 3 will open to Port 2 at the trip point. On falling pressure, Port 3 will close first. Then Port 1 will open to Port 2.

AMOT Model 4047 has a “dead spot” in the exact center position, which prevents the overlapping of Ports 1 and 3. Because of this, Ports 1 and 3 will not open and close simultaneously at the trip point.

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Overview

Model 4047 is used as a 2-Way or 3-Way high capacity, low pressure valve for settings from 0.1 psi falling to 11.2 psi rising over several ranges. Applications include sensing low pressure low pressure gas, water, fuel, oil, or for liquid level sensing and control. By piping to the vacuum port, the valve can be used to sense vacuum pressure from 0.1 psi falling. The 4047 can detect overload on gas engines by sensing the vacuum pressure in the intake manifold.

Operation

2-Way Valve to open on rising pressure
Port 1 must be plugged. Rising pressure will open
Port 2 to Port 3 above the trip point.

Valve to open on falling pressure
Port 3 must be plugged. Falling pressure will open
Port 2 to Port 1 below the set trip point.

3-Way Valve operation for 3-Way action is identical with that for 2-Way except that there will be no plugged ports. On valves set to trip on rising pressure, Port 1 will open to Port 2 until just below the trip point. Port 3 will open to Port 2 at the trip point. On falling pressure, Port 3 will close first. Then Port 1 will open to Port 2.

AMOT Model 4047 has a “dead spot” in the exact center position, which prevents the overlapping of Ports 1 and 3. Because of this, Ports 1 and 3 will not open and close simultaneously at the trip point.